SkCodec::Result SkIcoCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options, SkPMColor colorTable[], int* colorCount) {
if (!ico_conversion_possible(dstInfo)) {
return kInvalidConversion;
}
int index = 0;
SkCodec::Result result = kInvalidScale;
while (true) {
index = this->chooseCodec(dstInfo.dimensions(), index);
if (index < 0) {
break;
}
SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index);
SkImageInfo decodeInfo = fix_embedded_alpha(dstInfo, embeddedCodec->getInfo().alphaType());
result = embeddedCodec->startScanlineDecode(decodeInfo, &options, colorTable, colorCount);
if (kSuccess == result) {
fCurrScanlineCodec = embeddedCodec;
return result;
}
index++;
}
SkCodecPrintf("Error: No matching candidate image in ico.\n");
return result;
}
// FIXME: We should expose information about the encoded format on the
// SkImageGenerator, so the client can interpret the encoded
// format and request an output format. For now, as a workaround,
// we guess what output format the client wants.
static SkImageInfo fix_info(const SkCodec& codec) {
const SkImageInfo& info = codec.getInfo();
SkAlphaType alphaType = (kUnpremul_SkAlphaType == info.alphaType()) ? kPremul_SkAlphaType :
info.alphaType();
// Crudely guess that the presence of a color space means sRGB.
SkColorProfileType profileType = (codec.getColorSpace()) ? kSRGB_SkColorProfileType :
kLinear_SkColorProfileType;
return SkImageInfo::Make(info.width(), info.height(), info.colorType(), alphaType, profileType);
}
SkCodec::Result SkIcoCodec::onStartIncrementalDecode(const SkImageInfo& dstInfo,
void* pixels, size_t rowBytes, const SkCodec::Options& options,
SkPMColor* colorTable, int* colorCount) {
int index = 0;
while (true) {
index = this->chooseCodec(dstInfo.dimensions(), index);
if (index < 0) {
break;
}
SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index);
switch (embeddedCodec->startIncrementalDecode(dstInfo,
pixels, rowBytes, &options, colorTable, colorCount)) {
case kSuccess:
fCurrIncrementalCodec = embeddedCodec;
fCurrScanlineCodec = nullptr;
return kSuccess;
case kUnimplemented:
// FIXME: embeddedCodec is a BMP. If scanline decoding would work,
// return kUnimplemented so that SkSampledCodec will fall through
// to use the scanline decoder.
// Note that calling startScanlineDecode will require an extra
// rewind. The embedded codec has an SkMemoryStream, which is
// cheap to rewind, though it will do extra work re-reading the
// header.
// Also note that we pass nullptr for Options. This is because
// Options that are valid for incremental decoding may not be
// valid for scanline decoding.
// Once BMP supports incremental decoding this workaround can go
// away.
if (embeddedCodec->startScanlineDecode(dstInfo, nullptr,
colorTable, colorCount) == kSuccess) {
return kUnimplemented;
}
// Move on to the next embedded codec.
break;
default:
break;
}
index++;
}
SkCodecPrintf("Error: No matching candidate image in ico.\n");
return kInvalidScale;
}
/*
* Initiates the Ico decode
*/
SkCodec::Result SkIcoCodec::onGetPixels(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts, SkPMColor* colorTable,
int* colorCount, int* rowsDecoded) {
if (opts.fSubset) {
// Subsets are not supported.
return kUnimplemented;
}
if (!ico_conversion_possible(dstInfo)) {
return kInvalidConversion;
}
int index = 0;
SkCodec::Result result = kInvalidScale;
while (true) {
index = this->chooseCodec(dstInfo.dimensions(), index);
if (index < 0) {
break;
}
SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index);
SkImageInfo decodeInfo = fix_embedded_alpha(dstInfo, embeddedCodec->getInfo().alphaType());
SkASSERT(decodeInfo.colorType() == kN32_SkColorType);
result = embeddedCodec->getPixels(decodeInfo, dst, dstRowBytes, &opts, colorTable,
colorCount);
switch (result) {
case kSuccess:
case kIncompleteInput:
// The embedded codec will handle filling incomplete images, so we will indicate
// that all of the rows are initialized.
*rowsDecoded = decodeInfo.height();
return result;
default:
// Continue trying to find a valid embedded codec on a failed decode.
break;
}
index++;
}
SkCodecPrintf("Error: No matching candidate image in ico.\n");
return result;
}
SkCodec::Result SkIcoCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options) {
int index = 0;
SkCodec::Result result = kInvalidScale;
while (true) {
index = this->chooseCodec(dstInfo.dimensions(), index);
if (index < 0) {
break;
}
SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index).get();
result = embeddedCodec->startScanlineDecode(dstInfo, &options);
if (kSuccess == result) {
fCurrCodec = embeddedCodec;
return result;
}
index++;
}
SkCodecPrintf("Error: No matching candidate image in ico.\n");
return result;
}
/*
* Initiates the Ico decode
*/
SkCodec::Result SkIcoCodec::onGetPixels(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts,
int* rowsDecoded) {
if (opts.fSubset) {
// Subsets are not supported.
return kUnimplemented;
}
int index = 0;
SkCodec::Result result = kInvalidScale;
while (true) {
index = this->chooseCodec(dstInfo.dimensions(), index);
if (index < 0) {
break;
}
SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index).get();
result = embeddedCodec->getPixels(dstInfo, dst, dstRowBytes, &opts);
switch (result) {
case kSuccess:
case kIncompleteInput:
// The embedded codec will handle filling incomplete images, so we will indicate
// that all of the rows are initialized.
*rowsDecoded = dstInfo.height();
return result;
default:
// Continue trying to find a valid embedded codec on a failed decode.
break;
}
index++;
}
SkCodecPrintf("Error: No matching candidate image in ico.\n");
return result;
}